From the back of the book:
Flexible RPG systems like Fate Core are terrific if you have the time and energy to put into building a world. But we also realize that sometimes extensive prep just isn't feasible. The good news? You can still experience the Fate awesomeness with the help of the Fate Worlds expansion.
Fate Worlds Volume 2: Worlds in Shadow is the second in a two-volume
set. In Worlds on Fire, you get six rich story settings. Each setting includes
custom mechanics, NPCs, and story elements—all ready to go using the
system provided in Fate Core. We've got you covered regardless of your
flavor of RPG choice. Be a knight in a giant robot suit in Camelot Trigger, or
get on the grift with CrimeWorld. Fight off alien invaders in the court of Louis XV in Court/Ship, or indulge your time travel fantasies in Timeworks.
Whether you stick with one world or go on a grand tour, Fate Worlds will provide everything you need to develop your Fate Core adventure except the snacks.
Fate Worlds. All the worlds. Your stage.